Check Garhauer
I just replaced the fiddle block on my Hunter 31 last week. I shopped for Harken, Schaefer, Ronstan, but found Garhauer to have a very high quality product with the best price, fastest service and excellent warranty. I also have a Garhauer boom vang which is an excellent product, also reasonably priced. They have an online catalog on their WEB page: www.garhauer.com.